Answer in brief
CVE-2026-43490 records a High severity (CVSS 8.8) vulnerability in ksmbd: validate inherited ACE SID length. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <a7fb771314fb3a265d30f8ac245869a367ab065c || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <47c6e37a77b10e74f70d845ba4ea5d3cafa00336 || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <1aa60fea7f637c071f529ad6784aecca2f2f0c5f || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <c1d95c995d5bcb24b639200a899eda59cb1e6d64 || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <996454bc0da84d5a1dedb1a7861823087e01a7ae | a7fb771314fb3a265d30f8ac245869a367ab065c, 47c6e37a77b10e74f70d845ba4ea5d3cafa00336, 1aa60fea7f637c071f529ad6784aecca2f2f0c5f, c1d95c995d5bcb24b639200a899eda59cb1e6d64, 996454bc0da84d5a1dedb1a7861823087e01a7ae |
| Linux/Linuxgeneric | 5.15 | Not reported |
| Linux/Linuxgeneric | >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <00f053d97b63591cafd791dce8d6c53e1625dad1 || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <a7fb771314fb3a265d30f8ac245869a367ab065c || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <47c6e37a77b10e74f70d845ba4ea5d3cafa00336 || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <1aa60fea7f637c071f529ad6784aecca2f2f0c5f || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <c1d95c995d5bcb24b639200a899eda59cb1e6d64 || >=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <996454bc0da84d5a1dedb1a7861823087e01a7ae | 00f053d97b63591cafd791dce8d6c53e1625dad1, a7fb771314fb3a265d30f8ac245869a367ab065c, 47c6e37a77b10e74f70d845ba4ea5d3cafa00336, 1aa60fea7f637c071f529ad6784aecca2f2f0c5f, c1d95c995d5bcb24b639200a899eda59cb1e6d64, 996454bc0da84d5a1dedb1a7861823087e01a7ae |
Published upstream
May 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 30, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 26, 2026
In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate inherited ACE SID length smb_inherit_dacl() walks the parent directory DACL loaded from the security descriptor xattr. It verifies that each ACE contains the fixed SID header before using it, but does not verify that the variable-length SID described by sid.num_subauth is fully contained in the ACE. A malformed inheritable ACE can advertise more subauthorities than are present in the ACE. compare_sids() may then read past the ACE. smb_set_ace() also clamps the copied destination SID, but used the unchecked source SID count to compute the inherited ACE size. That could advance the temporary inherited ACE buffer pointer and nt_size accounting past the allocated buffer. Fix this by validating the parent ACE SID count and SID length before using the SID during inheritance. Compute the inherited ACE size from the copied SID so the size matches the bounded destination SID. Reject the inherited DACL if size accumulation would overflow smb_acl.size or the security descriptor allocation size.
Quoted source text, attributed separately from HOL analysis.